How do I update 3 columns using multiple selects as expressions

I'm just trying to update three columns based on a backup table.
I'm trying this but it doesn't work. As far as I can tell, it doesn't like something within the (). I've run those separately and they work fine.

update worksheet2 
SET `cascade-order` = (select `cascade-order` from worksheet_bak where sid = 56 ORDER BY wid DESC LIMIT 1;),
SET `cascade-name` = (select `cascade-name` from worksheet_bak where sid = 56 ORDER BY wid DESC LIMIT 1;),
SET levels = (select levels from worksheet_bak where sid = 56 ORDER BY `worksheet_bak`.`WID` DESC LIMIT 1;)
WHERE sid = 56 and sub = 'nums';

Select allOpen in new window

Right now I'm just trying to do this within phpmyadmin console. Later I'll take the working solution and run it through PHP.
Thanks for any help